Air-pressure pump.



E. A. RAVES.

AIR PRESSURE PUMP.

APPLICATION FILED DBO. 2a, 1910.

Lmggga, Patented Sept. 9,1913.

COLUMBIA PLANOGRAPH coqwAsmNc'roN. D364 EWALD A. nnvns, or AUBURN, NEW Yon-x, nssieriion fro r m AUBURN IGNITION MANUFACTURING co, or AUBURN, NEW YORK.

AIR-PRESSURE PUMP.

Specification of Letters Patent.

Patented Sept. 9, 191".

Application filed December 28, 1910. Serial No. 599,777.

. Pumps; and I dohereby declare the follow ing to be' a full, clear, and exact description of the invention, such. as will enable others skilled in the art to which it appertains to make and use the same.

'My present invention is an improvement in the class of air pressure pumps.

The ob ect of my invent on 1s to produce,

a pump of simple construction consisting of a small number of parts which parts can be easily assembled, and the individual parts of which can be removed and replaced by otherthan' skilled workmen or machinists, and further to produce a pump in which the liability to derangement from use shall be reduced to a minimum andone that shall require but littlecar'e and attention whenin use and that shall be practically closed against the admission of dust to the interior or working parts.

In the drawings I have illustrated my said invention anoliny said invention is disclosed in the following description and claims.

In said drawings, Figure 1 is aview inelevation of my improved pump; Fig. 2 is a vertical sectional view of the same in like position. Fig; 3 is a top view of thehold. ing ring. Fig. 4: is a transverse section of the pump cylinder on line H, Fig. 2. Fig. 5 is a vertical sectional view of the pump piston.

In these figures of drawing, A is the pump base within which is the crank chamber. This base consists of the main portion a in one piece having. a boss m at one end, the opposite end belng open but in the completed pump it is closed by the second part of the base a composed of a single plate. The boss a =is here shown as provided with the bushing a forming the bearing forthe driving shaft O. The bushing a may be dispensed with and the boss, 0. made to serve as a bearing for, the shaft. The upper side of the base is provided with an opening communieating with the crank chamber. The walls surrounding this opening are fitted to receive the cylinder B. This cylinder is composed of a single piece having exterior flanges 1) extending around it. At the bottom, the cylinder has a slightly broader flange '6' adapted to engage the top of the walls around the opening into" the crank chamber beyond which flange is a narrow extension Z2? from the cylinder to closely fit within said opening. The cylinder is thus made to communicate with the -crank chamber to its full extent. 7 The cylinder is secured to the base by the holding ring D and two rods or bolts D. The upper end of the cylinder is provided with a flange 6 extending outwardly somewhat beyond the flanges b having a flat upper surface within which the top of the cylinder rises in a circular convex or dome shape. The ring D is provided with two' openings at diametrically opposed to each other andthe flanges (3?, Z), Z)" are each recessed in alinement wit-h the openings (Z as shown at b in Fig; 4. The bolts D have their lower ends firmly fixed in the top of the base A and extend upward in engagement with the recesses b and t-hrough the openings 0) in the ring which lies upon the flange b of the cylinder. Nuts d on these T rods or bolts hold the ring D tightly down i upon the top of the cylinder and draw the 1 cylinder firmly down upon the pump base. The rods or bolts by preference; are fitted to the recesses b and the cylinder is thus held from all movement. The top of the cylinder is provided with an opening extending entirely through the same. This opening or at least the upper part of the same is threaded and a depending tubular extension e of the valve casing E is screwed therein.

. The valve casing is provided with inlet valve 0 and outlet valve e preferably of the type known as ball check valves, which require no lubrication. The driving shaft C is provided inside of. the crank chamber with the crank disk C and between the crank disk and the hearing with a' collar 0 of such size as to extend beyond and cover the opening in which the shaft is mounted. At the outer end of the boss a the shaft is provided with a collar 0 bearing against the outer end of the boss.

This collar is secured to the shaft by a set screw 0 preferably engaging a depression in the shaft.

The boss a is provided with an opening on its upper side extending through the same to the shaft C. This opening is threaded and receives a tube a the top of which is ordinarily closed ,by a check valve (1 lVhen it is desired to lubricate the shaft, the valve is depressed by the tip of the oiler or by other means and the tube filled with oil. When suflicient oil has been poured into the tube the valve is released and immediately closesthe tube.

The piston F is provided with the metallic packing rings f, f, f and is operated by the pitman Gr rigidly secured to a sleeve F movably mounted on a rod or cross bar F passing through openings in the lower part of the'pisto-n. The lower end of the pitman engages a crank pin 0 secured to the crank disk G. The opening in the pitman is provided with a bushing g which bears against the face of the disk, and is of such. extent as to bring the pitman into proper alinement with the piston.- The pitman may beheld on the pin by a cotter g or any other preferred means.

The closing plate a is secured to the main portion of the base by screws. This plate is, nearits lower side provided with a threaded opening and a short angular pipe H has its lower end secured therein. This pipe H is provided with a stop cock h.

Lubricating oil is furnished to the crank chamber through the cook 72,. This cock is closed after a suflicient supply of oil has been put in the chamber. The crank pin and pitman are lubricated by the oil in the crank chamber and the spray and oil vapor serve to lubricate the upper bearing of the pitman and the piston.

It will be seen from the foregoing description that the lubrication of all the parts requiring it, is provided for and yet all of said parts are protected against the admission of dust. In case the valves should fail to work properly, the valve case can be instantly removed and another put in its place. If it is desired to remove the cylinder the nuts on the top of the bolts or rods D are removed and the cylinder then can be lifted from its place. The piston and pitman can be then removed by wit-hdrawing the cotter from the crank pin. It will also be noted that when the cylinder is removed, and slightly lifted from the base the cotter pin 9 can be removed and the piston and cylinder may be moved laterally to disengage the lower end of the pitman from the crank pin thus disconnecting the cylinder and piston from the base without opening the base if desired, and therefore, avoiding draining from the crank chamber the contained lubricant.

While ho means for actuating the driv ing shaft is shown or described, it is to be understood that the same is to be given motion from some moving mechanism in any usual or preferred manner.

What I claim and desire to secure by Letters Patent is 1. In an air pump,the combination with the hollow base, of a detachable cylinder mounted thereon and communicating therewith, a crank shaft provided with a crank pin within said base, a piston in said cylinder, a pitman pivotally connected to said piston and having a bearing aperture engaging said crank pin, whereby by detaching the cylinder from said base and moving it laterally said pitman may be disengaged from the crank pin.

2. In an air pump, the combination with a hollow base comprising a single casting open at one side and provided with a boss at the opposite side and a closing plate for the said open base, a driving shaft mounted in said base, a crank disk within said base connected to said shaft and provided with a crank pin, a cylinder formed in one piece closed at the top and open at the bottom detachably supported on said base and communicating therewith, a piston in said cylinder, a pitman pivotally connected to said piston and provided at its lower end with an aperture adapted to be slipped over said crank pin, and an exterior valve casing secured to the closed end of said cylinder and provided with inlet and outlet valves.

3. In an air pump, the combination with a hollow base consisting of a single casting open at one side and provided with a boss at the other side, and a closing plate for the open side of said casting, a cylinder formed in one piece, open at the lower end and closed at the upper end, supported detachably on said base and communicating therewith, a piston in said cylinder, a pitman pivotally connected to said cylinder, and provided with an aperture in its lower end, a shaft mounted in said boss, a crank disk in said base provided with a crank pin engaging said aperture in the pitman, a collar interposed between the disk and the inner end of the said boss for holding the crank pin in proper alinement with the axis of the cylinder, and a collar on said shaft man pivoted to said piston at its upper end and held from lateral movement with respect thereto and provided with an aperture in its lower end, a driving shaft mounted in said boss, a crank disk on said shaft within said base, and provided with a crank pin extending toward said closing plate and engaging the aperture in the lower end of the pitman, a detachable device on said pin for engaging said pitman on the side toward said closing plate and an exterior valve casing communicating with the closed end of said cylinder, and provided with inlet and outlet valves.

In testimony whereof I aflix my signature, in the presence of two witnesses.

EWALD A. RAVEEJ. Witnesses:

E. CLAIN WARNE, WM. S. ELDER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, I). G. 

